The Informational Impacts of Congestion Tolls Upon Route Traffic Demands

This paper investigates the impact of information precision levels of state-dependent congestion tolls upon drivers’ welfare levels. To do this, network equilibrium models with state-dependent congestion tolls under an uncertain environment are formulated. The impacts of two alternative state-dependent congestion tolls schemes, i.e. ex ante tolls and ex post tolls, upon the drivers’ route choice behaviors are analyzed. Findings show that the introduction of a state-dependent congestion tolls system with advance information improves the total welfare level of drivers, even though traffic information may include some noises in designating network conditions. The perfect information systems with ex post tolls are also shown to maximize the drivers’ welfare among the proposed congestion toll schemes. Numerical examples are used to illustrate the proposed approach. Directions for future research are discussed.


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  • Accession Number: 01003120
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Aug 21 2005 12:37PM